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Effect of plasma coating on antibacterial activity of silver nanoparticles
Åbo Akademi University, Finland.
Tampere University of Technology, Finland.
Tampere University of Technology, Finland.
University of Turku, Finland.
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2019 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 672, p. 75-82Article in journal (Refereed) Published
Abstract [en]

Silver nanoparticles (NPs) are known to provide antimicrobial properties for surfaces. However, there are environmental concerns due to reports of toxicity after exposure to the environment during or after end-use. Immobilizing silver NPs to the surface of substrates could ensure that particles are readily available for antibacterial activity with limited environmental exposure. A plasma coating on top of silver NPs could improve the adhesion of NPs to a substrate, but it could also impede the release of silver NPs completely. Furthermore, silver has been shown to require direct contact to demonstrate antibacterial activity. This study demonstrates immobilization of silver NPs with plasma coating onto a surface while maintaining its antibacterial properties. Silver NPs are simultaneously synthesized and deposited onto a surface with liquid flame spray aerosol technique followed by hexamethyldisiloxane plasma coating to immobilize the NPs. Atomic force microscope scratch testing is used to demonstrate improved nanoparticle adhesion. Antibacterial activity against gram-negative Escherichia coli is maintained even for plasma coating thicknesses of 195 nm. NP adhesion to the surface is significantly improved. Gram-positive Staphylococcus aureus was found be resistant to all the plasma-coated samples. The results show promise of using plasma coating technology for limiting NP exposure to environment.

Place, publisher, year, edition, pages
2019. Vol. 672, p. 75-82
Keywords [en]
Antibacterial effects, Hexamethyldisiloxane, Liquid flame spray, Nanoparticles, Plasma coating, Scratch test, Silver, Adhesion, Atomic force microscopy, Coatings, Escherichia coli, Flame spraying, Metal nanoparticles, Spray guns, Substrates, Thickness measurement, Hexamethyl disiloxane, Silver nanoparticles
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37330DOI: 10.1016/j.tsf.2018.12.049Scopus ID: 2-s2.0-85059947796OAI: oai:DiVA.org:ri-37330DiVA, id: diva2:1281561
Note

 Funding details: Academy of Finland, 275 475, ER; Funding details: Åbo Akademi, ÅA, 307466; Funding text 1: This work was supported by the Academy of Finland under the project “Nanostructured large-area antibacterial surfaces ( nLABS , grant no. 275 475 )”. ER and JP wish to acknowledge the Center for Functional Materials (FunMat) at Åbo Akademi University and the Academy of Finland (grant no. 307466 ) for financial support.

Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-01-22Bibliographically approved

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